The TMU-72 coolant pressure tank is rated at approximately how many psig, including tolerance?

• A. 5100 ± 100 psig
• B. 5200 ± 150 psig
• C. 4800 ± 200 psig
• D. 5050 ± 50 psig

Answer: (A)

Pressure ratings for a coolant tank are given as a nominal value with a tolerance, reflecting both the typical internal pressure and allowable manufacturing variation. The psig rating tells you the pressure inside the tank relative to atmospheric pressure, which is crucial for safe operation and system performance.

For the TMU-72 coolant pressure tank, the spec lists a nominal value of about 5100 psig with a tolerance of ±100 psig. That means the safe range you should expect in practice is roughly 5000 to 5200 psig. This combination of nominal value and tolerance aligns with the official rating and ensures the tank operates safely under normal conditions.

Other options imply different nominal pressures or different tolerance bands (for example, a higher or lower center value or a wider/narrower range), which do not match the TMU-72’s specified rating. Therefore, the rating that matches the spec is 5100 ± 100 psig.